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	<meta charset="UTF-8">
	<title>调整tab的宽度</title>
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		background-color: #eee;
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	<pre>
		function* fibs() {
			let a = 0;
			let b = 1;
			while (true) {
				yield a;
				[a, b] = [b, a + b];
			}
		}

		let [first, second, third, fourth, fifth, sixth] = fibs();
		sixth // 5
	</pre>
	<pre class="tab-size">
		function* fibs() {
			let a = 0;
			let b = 1;
			while (true) {
				yield a;
				[a, b] = [b, a + b];
			}
		}

		let [first, second, third, fourth, fifth, sixth] = fibs();
		sixth // 5
	</pre>

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